The U.S. has countless swimming holes scattered throughout most states, many of which you’ve likely never heard of unless you’re from the area. Hawaii is home to many, including the two on this list: Chutes and Ladders off the side of a cliff in Mauiand Queen’s Bath in Kauai. Florida, too, is home to plenty of natural springs, aquifers, and swimming holes. One that you’ve likely never heard of is Devil’s Den, which is not only a great watering hole for snorkeling and diving, but also an archeological and paleontological treasure where ancient human artifacts and fossils of extinct species have been found.